题目内容：

填空

1.Yesterday I ____ _____ _____ (遭遇) a sandstorm.

2.Deserts are created because people______ ______(砍倒) trees and dig up grass.

3.He_____ ____ ____(放火烧)the houses and hundreds of houses caught fire.

4._____ _______(浏览) magazines to find pictures that you can stick on your poster.

5.Trees ______ _____(吸收) carbon dioxide and give out oxygen.

6.The report shows that we are making some progress but that we need to ________ ________ ___________(做出更大的努力) .

7.His father died, when he was young, and he was______ ______(抚养) by his mother.

8._____ ________(平均) there are twenty boys present every day .

9.I _______ ____(以…结束;最终) spending the night at the airport yesterday.

10.That will cost you 1,000 dollars _____ ______(总共).